A white, crystalline substance, C8H7N, obtained from blue indigo, and almost all indigo derivatives, by a process of reduction; chemically, it is 2,3-benzopyrrole, a bicyclic heterocyclic compound, having a benzene ring fused to a pyrrole ring. It is also formed from proteinaceous matter, together with skatol, by putrefaction, and by fusion with caustic potash, and is present in human excrement, as well as in the intestinal canal of some herbivora. It is produced in rich growth media by the intestinal bacterium Escherichia coli.

a benzene ring that is made of a six-member carbon-containing ring attached to a five-member nitrogen-containing ring

an organic molecular structure, consisting of the bicyclic of benzene and a pyrrole

A chemical compound formed by the bacterial decomposition of seafood.